<template>
  <div>
    <el-upload
      action="https://gulimall-i.oss-cn-beijing.aliyuncs.com"
      :data="dataObj"
      list-type="picture-card"
      :file-list="fileList"
      :before-upload="beforeUpload"
      :on-remove="handleRemove"
      :on-success="handleUploadSuccess"
      :on-preview="handlePreview"
      :limit="maxCount"
      :on-exceed="handleExceed"
    >
      <i class="el-icon-plus"></i>
    </el-upload>
    <el-dialog :visible.sync="dialogVisible">
      <img width="100%" :src="dialogImageUrl" alt/>
    </el-dialog>
  </div>
</template>
<script>
  import {policy} from "./policy";
  import {getUUID} from '@/utils'

  export default {
    name: "multiUpload",
    props: {
      //图片属性数组
      value: Array,
      //最大上传图片数量
      maxCount: {
        type: Number,
        default: 30
      }
    },
    data() {
      return {
        dataObj: {
          policy: "",
          signature: "",
          key: "",
          ossaccessKeyId: "",
          dir: "",
          host: "",
          uuid: ""
        },
        dialogVisible: false,
        dialogImageUrl: null
      };
    },
    computed: {
      fileList() {
        let fileList = [];
        for (let i = 0; i < this.value.length; i++) {
          fileList.push({url: this.value[i]});
        }

        return fileList;
      }
    },
    mounted() {
    },
    methods: {
      emitInput(fileList) {
        let value = [];
        for (let i = 0; i < fileList.length; i++) {
          value.push(fileList[i].url);
        }
        this.$emit("input", value);
      },
      handleRemove(file, fileList) {
        this.emitInput(fileList);
      },
      handlePreview(file) {
        this.dialogVisible = true;
        this.dialogImageUrl = file.url;
      },
      beforeUpload(file) {
        let _self = this;
        return new Promise((resolve, reject) => {
          policy()
            .then(response => {
              console.log("这是什么${filename}");
              _self.dataObj.policy = response.data.policy;
              _self.dataObj.signature = response.data.signature;
              _self.dataObj.ossaccessKeyId = response.data.accessid;
              _self.dataObj.key = response.data.dir + "/" + getUUID() + "_${filename}";
              _self.dataObj.dir = response.data.dir;
              _self.dataObj.host = response.data.host;
              resolve(true);
            })
            .catch(err => {
              console.log("出错了...", err)
              reject(false);
            });
        });
      },
      handleUploadSuccess(res, file) {
        this.fileList.push({
          name: file.name,
          // url: this.dataObj.host + "/" + this.dataObj.dir + "/" + file.name； 替换${filename}为真正的文件名
          url: this.dataObj.host + "/" + this.dataObj.key.replace("${filename}", file.name)
        });
        this.emitInput(this.fileList);
      },
      handleExceed(files, fileList) {
        this.$message({
          message: "最多只能上传" + this.maxCount + "张图片",
          type: "warning",
          duration: 1000
        });
      }
    }
  };
</script>
<style>
</style>


